<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script src="https://cdn.staticfile.org/react/16.4.0/umd/react.development.js"></script>
<script src="https://cdn.staticfile.org/react-dom/16.4.0/umd/react-dom.development.js"></script>
<!-- 生产环境中不建议使用 -->
<script src="https://cdn.staticfile.org/babel-standalone/6.26.0/babel.min.js"></script>
<script src="https://cdn.bootcss.com/prop-types/15.6.1/prop-types.js"></script>

<div id="test"></div>

<script type="text/babel">
    //类式组件

    class Person extends React.Component {

        //不要过度使用ref，可以使用event.target
        //返回一个存储ref标识的容器
        myRef=React.createRef()
        render() {
            return (
                <div>
                    <input ref={this.myRef} type="texinput1" placeholder="点击按钮提示数据"/>&nbsp;
                    <button onClick={this.showData}>点我提示左侧的数据</button>
                    &nbsp;
                </div>
            )
        }

        showData = () => {
            // const {input1} = this.refs
            const {myRef} = this
            alert(myRef.current.value)
        }

    }


    ReactDOM.render(<Person/>, document.getElementById("test"))
</script>
</body>
</html>